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浙江大学学报(工学版)
浙江大学学报(工学版)  2021, Vol. 55 Issue (3): 578-585    DOI: 10.3785/j.issn.1008-973X.2021.03.019
计算机与控制工程     
循环流化床外置换热器壁温偏差改进措施
聂立1,2(),蔡润夏3,鲁佳易2,*(),程伟2,张文杰2,巩李明2,薛大勇2,张缦3,杨海瑞3,吕俊复3
1. 浙江大学 能源工程学院，浙江 杭州 310027
2. 清洁燃烧与烟气净化四川省重点实验室，四川 成都 611731
3. 清华大学 热科学与动力工程教育部重点实验室，北京 100084
Improvements of non-uniform distribution of tube wall temperatures in circulating fluidized bed boiler’s external heat exchangers
Li NIE1,2(),Run-xia CAI3,Jia-yi LU2,*(),Wei CHENG2,Wen-jie ZHANG2,Li-ming GONG2,Da-yong XUE2,Man ZHANG3,Hai-rui YANG3,Jun-fu LV3
1. College of Energy Engineering, Zhejiang University, Hangzhou 310027, China
2. Clean Combustion and Flue Gas Purification Key Laboratory of Sichuan Province, Chengdu 611731, China
3. Key Laboratory for Thermal Science and Power Engineering of Ministry of Education, Tsinghua University, Beijing 100084, China
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摘要：

为了解决660 MW超超临界循环流化床锅炉外置换热器中受热面的壁温偏差问题，通过数值计算，复现600 MW超临界循环流化床锅炉外置换热器壁温分布，并将该方法应用到相同尺寸的超超临界循环流化床锅炉外置换热器壁温计算中. 通过对边壁区域3片管屏工质节流，从工质侧解决超超临界循环流化床锅炉外置换热器壁温偏差问题，使受热面计算壁温偏差控制在30°C以内，实现受热面管材安全运行. 通过冷态试验，发现颗粒侧传热系数沿外置换热器宽度方向呈现马鞍形的双峰分布，传热系数最大值出现在距离边壁约0.2倍宽度范围内，通过调整边壁区域气体速度可以提高该区域的传热系数，为运行过程减缓局部偏差提供参考.
关键词： 超超临界;  循环流化床;  锅炉;  外置换热器;  壁温偏差    
Abstract:

A wall temperature distribution of the external heat exchanger of 600 MW supercritical circulating fluidized bed boiler was reproduced by numerical calculation, in order to solve the wall temperature deviation of the external heat exchanger of 660 MW ultra supercritical circulating fluidized bed boiler. The result was applied to the calculation of wall temperature of the same size external heat exchanger of ultra-supercritical circulating fluidized bed boiler. By throttling the working medium of three tube platens near side wall, the calculated wall temperature deviation of external heat exchanger of ultra-supercritical circulating fluidized bed boiler was solved. The wall temperature deviation of heating surface could be controlled within 30°C to keep safe operation of heating surface tubes. Experimental results show that the heat transfer coefficient of the particle side presents a saddle shaped bimodal distribution along the width direction of the external heat exchanger, and the maximum value of the heat transfer coefficient appear at about 0.2 times width near the side wall. By adjusting the gas velocity in the side wall area, the heat transfer coefficient can be improved, so as to provide guidance for slowing down the local deviation in the operation process.
Key words: ultra supercritical    circulating fluidized bed    boiler    external heat exchanger    tube wall temperature deviation
收稿日期: 2020-02-10 出版日期: 2021-04-25
CLC:  TK 229.6  
基金资助: 国家重点研发计划资助项目（2016YFB0600204）
通讯作者: 鲁佳易     E-mail: niel@dbc.com.cn;lujy@dbc.com.cn
作者简介: 聂立（1971—），男，教授级高级工程师，从事循环流化床技术与装备研究. orcid.org/0000-0002-2790-0127.E-mail： niel@dbc.com.cn
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聂立
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薛大勇
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引用本文:

聂立,蔡润夏,鲁佳易,程伟,张文杰,巩李明,薛大勇,张缦,杨海瑞,吕俊复. 循环流化床外置换热器壁温偏差改进措施[J]. 浙江大学学报(工学版), 2021, 55(3): 578-585.

Li NIE,Run-xia CAI,Jia-yi LU,Wei CHENG,Wen-jie ZHANG,Li-ming GONG,Da-yong XUE,Man ZHANG,Hai-rui YANG,Jun-fu LV. Improvements of non-uniform distribution of tube wall temperatures in circulating fluidized bed boiler’s external heat exchangers. Journal of ZheJiang University (Engineering Science), 2021, 55(3): 578-585.

链接本文:

http://www.zjujournals.com/eng/CN/10.3785/j.issn.1008-973X.2021.03.019    或    http://www.zjujournals.com/eng/CN/Y2021/V55/I3/578

图 1  600 MW CFB锅炉高再外置换热器壁温偏差
图 2  CFB锅炉外置换热器示意图
图 3  外置换热器冷态试验系统示意图
图 4  外置换热器试验装置本体结构示意图
图 5  试验传热探头示意图
图 6  600 MW CFB锅炉外置换热器计算壁温与实测壁温对比
图 7  节流后超超临界CFB锅炉外置换热器壁温分布
图 8  外置换热器流化速度对传热系数分布的影响
图 9  外置换热器布风板阻力随风速的变化曲线
图 10  外置换热器床层高度对传热系数分布的影响
图 11  调整布风对外置换热器传热系数影响
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